BitBeat: Is It Bitcoin, or bitcoin? The Orthography of the Cryptography

Should bitcoin take an upper- or lowercase “B”? If you’re in the words business, it’s not an idle question, and the answer to the question actually helps address that other question, what exactly is bitcoin?

You all remember the rule, right? Proper nouns take an uppercase letter, common nouns take a lowercase letter. So, for “Gravity,” the movie, you’d use an uppercase “G’,” but for gravity, the scientific concept, you’d use a lowercase “g.” Therefore, how do you characterize bitcoin?